Well, the 10-22 is wider! That's the only advantage. If you want a wide lens, you have to go shorter than 17mm for a crop sensor camera. 17mm on an APS-C sized sensor camera gives you the same angle of view that a 27mm lens would on a normal 35mm film camera. That's wide, but not very wide. If you want very wide (similar to the angle of view of a 17, 20 or 24mm lens on a 35mm film camera), you need the 10-22 (or something with a similar fcoal length range). See http://www.bobatkins.com/photography/reviews/wide-angle-lenses.html for your options in that regard.